Added Header and Footer support using Skia

chrome/renderer/print_web_view_helper.h

Index: chrome/renderer/print_web_view_helper.h
diff --git a/chrome/renderer/print_web_view_helper.h b/chrome/renderer/print_web_view_helper.h
index 81d40e3cd716dba45740ed2e1fe8e0e7274b2c63..ce78ed5d850dbe44efaadd7ca55489d4fa36f04e 100644
--- a/chrome/renderer/print_web_view_helper.h
+++ b/chrome/renderer/print_web_view_helper.h
@@ -11,9 +11,13 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/shared_memory.h"
 #include "base/time.h"
+#include "base/values.h"
 #include "content/renderer/render_view_observer.h"
 #include "content/renderer/render_view_observer_tracker.h"
 #include "printing/metafile.h"
+#include "skia/ext/vector_canvas.h"
+#include "skia/ext/vector_platform_device_skia.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrameClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewClient.h"
 #include "ui/gfx/size.h"
@@ -66,6 +70,25 @@ class PrepareFrameAndViewForPrint {
   DISALLOW_COPY_AND_ASSIGN(PrepareFrameAndViewForPrint);
 };
 
+// Struct that holds margin and content area information of a page.
+typedef struct PageSizeMargins {
+  double content_width;
+  double content_height;
+  double margin_top;
+  double margin_right;
+  double margin_bottom;
+  double margin_left;
+} PageSizeMargins;
+
+// Given the |device| and |canvas| to draw on, prints the appropriate headers
+// and footers using strings from |header_footer_info| on to the canvas.
+void PrintHeaderAndFooter(skia::VectorPlatformDeviceSkia* device,
+                          const SkRefPtr<skia::VectorCanvas>& canvas,
+                          int page_number, int total_pages,
+                          float webkit_scale_factor,
+                          PageSizeMargins& page_size_margins,
+                          const DictionaryValue* header_footer_info);
+
 // PrintWebViewHelper handles most of the printing grunt work for RenderView.
 // We plan on making print asynchronous and that will require copying the DOM
 // of the document and creating a new WebView with the contents.
@@ -110,7 +133,11 @@ class PrintWebViewHelper : public RenderViewObserver,
   void OnInitiatePrintPreview();
 
   // Start the process of generating a print preview using |settings|.
-  void OnPrintPreview(const base::DictionaryValue& settings);
+  // |header_footer_info| contains the necessary strings generated by the
+  // browser process to be printed as headers and footers if requested by the
+  // user.
+  void OnPrintPreview(const base::DictionaryValue& settings,
+                      const DictionaryValue& header_footer_info);
   // Initialize the print preview document.
   bool CreatePreviewDocument();
 
@@ -188,7 +215,8 @@ class PrintWebViewHelper : public RenderViewObserver,
   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
                          const gfx::Size& canvas_size,
                          WebKit::WebFrame* frame,
-                         printing::Metafile* metafile);
+                         printing::Metafile* metafile,
+                         bool is_preview);
 #else
   void PrintPageInternal(const PrintMsg_PrintPage_Params& params,
                          const gfx::Size& canvas_size,
@@ -206,7 +234,8 @@ class PrintWebViewHelper : public RenderViewObserver,
 #elif defined(OS_MACOSX)
   void RenderPage(const gfx::Size& page_size, const gfx::Rect& content_area,
                   const float& scale_factor, int page_number,
-                  WebKit::WebFrame* frame, printing::Metafile* metafile);
+                  WebKit::WebFrame* frame, printing::Metafile* metafile,
+                  bool is_preview, bool display_header_footer);
 #elif defined(OS_POSIX)
   bool RenderPages(const PrintMsg_PrintPages_Params& params,
                    WebKit::WebFrame* frame, WebKit::WebNode* node,
@@ -220,16 +249,10 @@ class PrintWebViewHelper : public RenderViewObserver,
   bool CopyMetafileDataToSharedMem(printing::Metafile* metafile,
                                    base::SharedMemoryHandle* shared_mem_handle);
 
-  void GetPageSizeAndMarginsInPoints(
+  PageSizeMargins GetPageSizeAndMarginsInPoints(
       WebKit::WebFrame* frame,
       int page_index,
-      const PrintMsg_Print_Params& default_params,
-      double* content_width_in_points,
-      double* content_height_in_points,
-      double* margin_top_in_points,
-      double* margin_right_in_points,
-      double* margin_bottom_in_points,
-      double* margin_left_in_points);
+      const PrintMsg_Print_Params& default_params);
 
   void UpdatePrintableSizeInPrintParameters(WebKit::WebFrame* frame,
                                             WebKit::WebNode* node,
@@ -277,6 +300,10 @@ class PrintWebViewHelper : public RenderViewObserver,
 
   scoped_ptr<PrintMsg_PrintPages_Params> old_print_pages_params_;
 
+  // Contains strings generated by the browser process to be printed as headers
+  // and footers if requested by the user.
+  const DictionaryValue* header_footer_info_;
+
   // Keeps track of the state of print preview between messages.
   class PrintPreviewContext {
    public: